How many times can you mention “resizable BAR” in an article without explaining what…

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The MSI MAG B550M Mortar is among the first B550 boards to receive Resizable BAR support (Image source: MSI)
The MSI MAG B550M Mortar is among the first B550 boards to receive Resizable BAR support (Image source: MSI)

MSI has started rolling out a new AGESA update for its B550 and X570 motherboards, enabling Resizable BAR support for older Ryzen systems, as well as NVIDIA Ampere GPUs.

MSI has started rolling out the new AGESA 1.1.9.0 update for AMD B550 and X570 motherboards. The BIOS update will enable Resizable BAR on a far wider range of hardware configurations than AMD’s SAM (Smart Access Memory) implementation. 

As of now, just the B550M Mortar and B550M Mortar WiFi have received the update. However, we expect a much wider range of MSI motherboards, including the well-received MAG X570 Tomahawk WiFi, to receive it in the weeks to come. 

Shortly after AMD announced Smart Access Memory support for Ryzen 5000 and Big Navi-based systems, NVIDIA stated that it was working on a similar solution since the underlying technology is part of the PCI-e specification. NVIDIA has yet to roll out driver support for Resizable BAR, but with wider motherboard support, we expect this to happen shortly as well. 

Resizable BAR has a small, but noticeable, performance impact in a number of games. Titles like Assassin’s Creed: Valhalla benefit from 10 percent higher framerates, while minimum framerates go up in games like Red Dead Redemption 2. For systems with cards like the GeForce RTX 3080 and RX 6800 XT, which are often right at the cusp of offering 4K/60 experiences, Resizable BAR could push performance up to optimal levels. 

Arjun Krishna Lal, 2020-12-26 (Update: 2020-12-26)

Arjun Krishna Lal

I’ve had a passion for PC gaming since 1996, when I watched my dad score frags in Quake as a 1 year-old. I’ve gone on to become a Penguin-published author and tech journalist. When I’m not traveling the world, gathering stories for my next book, you can find me tinkering with my PC.

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